HBV S基因的反义锁核酸对乙型肝炎转基因小鼠HBV复制和表达的影响

Antiviral effects of locked nucleic acid antisense oligonucleotides targeting the HBV preS1 gene in HepG2 2.2.15 cells

AIM: To investigate the inhibitory effects of locked nucleic acid (LNA) antisense oligonucleotides targeting the purine region of the hepatitis B virus (HBV) preS1 gene in HepG2 2.2.15 cells, and to screen effective LNA anti-gene oligonucleotides.

METHODS: LNA anti-gene oligonucleotides of different lengths that were complementary to the purine-abundant regions (2 941-2 962 nt, 3 015-3 036 nt and 3 089-3 110 nt) of the HBV preS1 gene were designed, synthesized, and introduced into HepG2 2.2.15 cells by cationic liposome-mediated transfection. Hepatitis B surface antigen (HBsAg) and HBV DNA levels in cell supernatants were tested by time-resolved fluorescence immune assay (TRFIA) and fluorescent quantitative polymerase chain reaction (FQ-PCR) 1, 3, 5 and 7 d after transfection. The cell toxicity of LNA anti-gene oligonucleotides was detected by methyl thiazolyl tetrazolium (MTT) assay.

RESULTS: LNA anti-gene oligonucleotides targeting the HBV preS1 gene showed strong inhibitory effects on HBV DNA replication and HBsAg expression in vitro, and the effects were time-dependent. Seven days after transfection, the reduced rates of HBV DNA and HBsAg levels were 64.32% and 67.51%, respectively. The inhibitory effects were significantly different between each experimental group and control group (all P < 0.05). The inhibitory effect of the LNA anti-gene oligonucleotide targeting the region 2 941-2 962 nt was most strong. The optimal length of LNA anti-gene oligonucleotides ranges from 20 to 30 bases. No obvious cell toxicity was observed with LNA anti-gene oligonucleotides.

CONCLUSION: LNA anti-gene oligonucleotides targeting the HBV preS1 gene showed strong inhibitory effects on HBV replication in vitro. The inhibitory effect of the LNA anti-gene oligonucleotide targeting the region 2 941-2 962 nt was most strong, and the optimal length of LNA anti-gene oligonucleotides ranges from 20 to 30 bases.

Antiviral effects of locked nucleic acid antisense oligonucleotides targeting HBV S gene mRNA in HepG2 2.2.15 cells

AIM: To investigate the inhibitory effects of locked nucleic acid (LNA) antisense oligonucleotides targeting hepatitis B virus (HBV) S gene in HepG2 2.2.15 cells, and screen effective LNA antisense oligonucleotides.

METHODS: Four LNA antisense oligonucleotides of different lengths that are complementary to the translation initiation region of HBV S gene were designed, synthesized, and introduced into HepG2 2.2.15 cells by cationic liposome-mediated transfection. Hepatitis B surface antigen (HBsAg) and HBV DNA levels in cell supernatant were tested by enzyme-linked immunosorbent assay (ELISA) and fluorescent quantitative-polymerase chain reaction (FQ-PCR) 24, 48 and 72 h after transfection. The cell toxicity of LNA antisense oligonucleotides was detected by methyl thiazolyl tetrazolium (MTT) assay.

RESULTS: All four LNA antisense oligonucleotides (10, 15, 20 and 25 base, respectively) could inhibit the expression of HBsAg and the replication of HBV DNA. Seventy-two hours after transfection, the reduced rates of HBsAg and HBV DNA levels were 46.58%, 54.38%, 72.43% and 69.92% as well as 27.09%, 28.77%, 34.71% and 32.68%, respectively. No obvious cell toxicity of LNA antisense oligonucleotides was noted.

CONCLUSION: LNA antisense oligonucleotides targeting HBV S gene show strong inhibitory effects on HBV replication in vitro. The optimal length of LNA antisense oligonucleotides ranges from 15 to 25 base. LNA antisense oligonucleotides targeting HBV S gene have a therapeutic potential in patients infected with HBV.